Glass manufacturing – With molten glass charge cutting or scraping means
Patent
1982-11-29
1984-10-09
Lindsay, Jr., Robert L.
Glass manufacturing
With molten glass charge cutting or scraping means
65332, 83601, 83646, C03B 712
Patent
active
044759380
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application corresponding to PCT/EP82/100026 filed Feb. 12, 1982 and based upon German application P3113 303.7 filed Apr. 2, 1981 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a cutting device for the sectioning of a liquid glass strand into individual fragments (gobs) for further processing into hollow glass articles.
BACKGROUND OF THE INVENTION
The object of such a cutting device is to section the flowing, i.e. moving glass strand by a mechanical cutting operaton. The problem resides in the fact that the temperature of the liquid glass is relatively high so that the cut has to be performed quickly in order to avoid unacceptable heating of the cutting device. This rapid action also is necessary because otherwise the glass strand issuing from the feeding device would become congested. In addition the cut has to be performed neatly so that no glass fibers are pulled or dirtying of the glass occurs.
It is known to use cutting devices for this purpose whose cutting elements are disposed on scissor arms and move in opposite directions while performing the cut. These shear blades are driven mechanically via cam disks, electrically by way of eccentrics or pneumatically by appropriate means.
The disadvantage of this known shear structure is that the glass strand is virtually hacked through, i.e. a quick hit occurs from two sides, which together with the angular shape of the cutting elements cause the glass strand to be separated in a jerky manner. If the glass temperature and thus the deformation properties of the glass are not constant over the cross-sectional area, the resistance to be overcome by the two scissor blades is not exactly the same. Consequently, the penetration speed of one blade changes relatively to that of the other blade so that the glass strand is pressed into the direction of easier deformability. This results in a throw-off of the glass strand or the separated fragments in that direction. As a result the processing on the machine designed to receive the separated fragment becomes much more difficult. Another disadvantage of the known shear structure is the relatively large mass which must be moved with every cut. Thus, limits are imposed a priori upon an increase in the production speed.
SUMMARY OF THE INVENTION
In order to avoid these disadvantages, the invention proposes a cutting device having a housing or the like in which several partially overlapping cutting elements constituting a cutting unit are disposed around the glass strand and are each rotatably journaled at one end and connected with a planetary gearing or the like whose outer ring gear is connected with a drive. The cutting elements of a cutting unit thus execute a combined motion, namely on the one hand concentric from the outside to the center of the glass strand and on the other hand a pulling motion analogous to that of a knife cut. The cutting speed can be relatively high since the masses to be moved are kept low. The course of the cut is controlled in time according to the path traversed by the cutting elements and to their speed.
Advantageously, the cutting edges of the cutting elements are of curved shape, which can be either concave or convex.
The curvature of the cutting elements is so shaped and they are so arranged that the range of motion extends from total disengagement of the glass strand to its sectioning, i.e. to slightly past the central axis of the glass strand.
The cutting elements can consist of disk-shaped ring segments, but it is also possible to give them an elliptical shape.
One housing can contain several cutting units so that it is possible to cut several glass strands parallel to one another. The cutting units of a cutting device can have a commmon drive acting upon toothed rack which in turn meshes with the outer ring gear of the planetary gearings.
Hydraulic rotary pistons can be used as drives for several cutting units.
The hydraulic drives are actuated through switching v
REFERENCES:
patent: 1568531 (1926-01-01), Reynolds
patent: 2271271 (1942-01-01), Meyers
patent: 3736826 (1973-06-01), Ward
patent: 3954033 (1976-05-01), Tipton
patent: 4214497 (1980-07-01), Dahms
patent: 4374659 (1983-02-01), Davey
Dubno Herbert
Lindsay, Jr. Robert L.
Ross Karl F.
Veba-Glas AG
LandOfFree
Cutting device for sectioning liquid glass strand does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cutting device for sectioning liquid glass strand, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cutting device for sectioning liquid glass strand will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1598545